Severed connection when Mac Pro's display sleeps

So I have a Mac Pro and a Macbook connected in a network via the ethernet I use to access the internet. Shared some files out, everything works fine and dandy.
BUT,
when the Mac Pro's display goes to sleep the connection is lost. I noticed the Mac Pro takes considerably longer to awaken it's display then does my Macbook, might this have something to do with it - that is, does the entire comp just go to sleep with it's display?
Any help would be greatly appreciated.

My approach would be to first remove any non-apple USB devices. Unplug any monitors from the USB connections and other USB peripherals. Restart. If it's still there, start from a second account. Create one if you don't have one. If it disappears then it's a software issue in your admin user directory. Still there? Start from your DVD. If it's still there then it's hardware and time for a repair. If it disappears then it's software and the approaches are many and varied. You might try resetting your graphics card to ensure it's well connected.

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